Cap assembly with desirable safety performance

a cap assembly and safety performance technology, applied in secondary cell servicing/maintenance, battery components, cell components, etc., can solve the problems of safety accident that may occur in the discharge process of these kinds of lithium ion batteries, no effective protection device to improve safety performance, etc., and achieve the effect of desirable safety performan
US8409736B2Active Publication Date: 2013-04-02DONGGUAN AMPEREX TECH +1
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
DONGGUAN AMPEREX TECH
Publication Date
2013-04-02

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Abstract

A cap assembly with desirable safety performance for use in lithium ion batteries, includes an insulating gasket defining a through hole therein, a rupture plate positioned in the through hole, a vent plate defining an air hole electrically connected with the rupture plate, a current interrupt device disposed on the rupture plate, and an end cap defining an air exhaust hole assembled on the current interrupt device. The current interrupt device has an upper conductive plate electrically connected with the end cap, a lower conductive plate electrically connected with the rupture plate, and a fuse electrically connecting the upper conductive plate and the lower conductive plate. When the current intensity in the lithium ion battery exceeds a predetermined value, the fuse melts to cut off the current path.
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Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] The present patent application claims the benefit of Chinese Patent Application No. 200920059057.3, filed Jun. 24, 2009, the disclosure of which is hereby incorporated herein by reference in its entirety.FIELD OF THE INVENTION

[0002] The present patent application generally relates to lithium ion batteries and, more particularly, to a cap assembly with desirable safety performance for use in lithium ion batteries.BACKGROUND OF THE INVENTION

[0003] Recently, lithium ion batteries, especially, cylindrical lithium ion batteries, are widely used in various kinds of portable electronic devices, such as video cameras, laptop personal computers, portable DVDs and personal digital assistants, due to high energy density, high working voltage and long life span.

[0004] At present, much more attentions have been paid to the safety performance of lithium ion batteries because of the use of high-energy chemical materials and energy concentration. Conventiona...

Claims

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